Interfaces.

interfaces.sh

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+#
+#   /etc/network/interfaces
+#
+
+# Loopback.
+auto lo
+iface lo inet loopback
+
+# Another loopback.
+auto lo:50
+iface lo:50 inet static
+    address 192.168.0.1
+    netmask 255.255.255.255
+
+# VLANs.
+auto eth0
+auto eth0.100
+auto eth0.333
+auto eth0.333.400
+
+# Physical interface,
+iface eth0 inet manual
+    mtu 1508
+    pre-up /sbin/ifconfig eth0 mtu 1508
+
+# Vlan 100.
+iface eth0.100 inet static
+    address <IP_ADDR>
+    netmask <IP_MASK>
+    gateway <GATEWAY>
+    dns-nameservers <DNS1> <DNS2>
+    mtu 1500
+
+# Vlan 333.
+iface eth0.333 inet manual
+    mtu 1500
+    up /sbin/vconfig add eth0.333 400
+
+# Vlan 333.400.
+iface eth0.333.400 inet static
+    address <IP_ADDR>
+    netmask <IP_MASK>
+    mtu 1500
+    pre-up /sbin/ifconfig eth0.333 up